Fornovolasco (Alpi Apuane, Tuscany, Italy): type locality for the Permian felsic magmatism in the Northern Apennines

Pieruccioni, Diego; Galanti, Yuri; Biagioni, Cristian; D’Orazio, Massimo; Molli, Giancarlo; Vezzoni, Simone

doi:10.1007/s00531-020-01887-9

Cited by 1 publication

(3 citation statements)

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“…Field evidence and petrographic investigation of the Fornovolasco Metarhyolite Fm are described by Vezzoni et al [20]. In addition to the main rock bodies cropping out close to the Fornovolasco hamlet [19,21], several smaller bodies occur in the Sant'Anna tectonic window (Figure 2). They are decimeter-to decameter-sized and are usually flattened on the main field foliation.…”

Section: Field and Petrographic Investigationmentioning

confidence: 81%

“…The Massa Unit consists of a Paleozoic metasedimentary and metavolcanics basement and an upper Permian-Upper Triassic metasilicoclastic succession (Figure 1; e.g., [16,17]). The Apuane Unit includes a litho-stratigraphic sequence made up of a Paleozoic basement (e.g., [18]) intruded by post-Variscan magmatic rocks (Fornovolasco Metarhyolite Fm; [19][20][21]), unconformably overlain by an Upper Triassic-Oligocene metasedimentary succession (Figures 1 and 2; e.g., [16]).…”

Section: Regional Geologymentioning

confidence: 99%

“…270 Ma). The Fornovolasco Metarhyolite Fm occurs as decameter-sized lensoid bodies embedded within the "Filladi Inferiori" Fm, commonly associated with the facies previously referred to as "Fornovolasco Schists" [21,34].…”

Section: The Paleozoic Succession Of Sant'anna Tectonic Windowmentioning

confidence: 99%

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Permian Hydrothermal Alteration Preserved in Polymetamorphic Basement and Constraints for Ore-genesis (Alpi Apuane, Italy)

et al. 2020

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The reconstruction of the polymetamorphic history of basement rocks in orogens is crucial for deciphering past geodynamic evolution. However, the current petrographic features are usually interpreted as the results of the metamorphic recrystallization of primary sedimentary and/or magmatic features. In contrast, metamorphic rocks derived by protoliths affected by pre-metamorphic hydrothermal alterations are rarely recognized. This work reports textural, mineralogical and geochemical data of metasedimentary and metaigneous rocks from the Paleozoic succession of the Sant’Anna tectonic window (Alpi Apuane, Tuscany, Italy). These rocks were recrystallized and reworked during the Alpine tectono-metamorphic event, but the bulk composition and some refractory minerals (e.g., tourmaline) are largely preserved. Our data show that the Paleozoic rocks from the Alpi Apuane were locally altered by hydrothermal fluids prior to Alpine metamorphism, and that the Permian magmatic cycle was likely responsible for this hydrothermal alteration. Finally, the Ishikawa Alteration Index, initially developed for magmatic rocks, was applied to metasedimentary rocks, providing a useful geochemical tool for unravelling the hydrothermal history of Paleozoic rocks, as well as a potential guide to the localization of hidden ore deposits in metamorphic terranes.

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Section: Field and Petrographic Investigationmentioning

confidence: 81%